Lift truck with variable range with at least three wheels

Abstract

A lift truck with variable range with at least three wheels and a telescopic arm. The lift truck includes a steerable rear wheel and two front wheels, a driver station and a motor propulsion group secured to a chassis. The chassis has a compact configuration and is elongated in the longitudinal direction of advance of the truck, and has safety elements against the risk of loss of lateral stability. The safety elements are adapted to oppose turning over of the truck. The truck also includes a device to limit the maximum speed of advance based on a turning angle of the steerable wheel.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a motor driven lift truck, with variable range, in which the front end of the telescopic arm extends in front of the front wheels in the load carrying position.[0002]The invention is particularly useful as a lift truck with variable range with three wheels.[0003]There are known trucks with variable range with three wheels sold by the French company MANITOU BF under the name TMT: these trucks with variable range with three wheels have a U-shaped chassis, so as to be able to retract a load within the U-shaped chassis in the transport position. These trucks are particularly adapted to be loaded on the rear of a carrying vehicle, as is described in EP0 701 963.[0004]Because of the particular structure of the TMT trucks adapted to be loaded on the rear of a carrying vehicle, these trucks have the drawback of a wide front track of the order of 2 meters and a short wheelbase of the order of 1.40 meter. This structure also has the dr...

AI Technical Summary

Benefits of technology

[0007]A second object of the invention is to provide a new lift truck with variable range, with at least three wheels, of simple and economical structure, having a telescopic arm of notable length, permitting achieving a substantial lifting height.

[0008]A third object of the invention is to provide a new lift truck with variable range, with at least three wheels, in which the front end of the telescopic arm extends in front of the front wheels in the load transport position, and having good lateral stability when turning.

[0009]A fourth object of the invention is to provide a new lift truck with variable range, with at least three wheels, in which the front end of the telescopic arm extends in front of the front wheels in the load transport position, having good lateral stability when turning without requiring the intervention of the operator in the driver's seat.

[0020]the system limiting the maximum speed of advance as a function of the wheel angle comprises a valve for reducing the control pressure of the hydrostatic transmission of the truck,

Problems solved by technology

Because of the particular structure of the TMT trucks adapted to be loaded on the rear of a carrying vehicle, these trucks have the drawback of a wide front track of the order of 2 meters and a short wheelbase of the order of 1.40 meter.

This structure also has the drawback of a relatively short telescopic arm, permitting reaching a lifting height of the order of 3 meters.

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